standard aluminium extrusions.Hardness Testing Methods of Die Casting Products

　　Hardness Testing Methods of Die Casting Products

　　Hardness is an important mechanical property of die casting products as it provides information about the product's resistance to deformation, wear, and penetration. There are several common methods for testing the hardness of die casting products.

　　One of the most widely used methods is the Brinell hardness test. In this method, a hardened steel ball of a specific diameter is pressed into the surface of the die casting sample under a known load for a certain period. The diameter of the indentation left on the surface is measured, and the Brinell hardness number (HB) is calculated based on the load and the indentation diameter. This method is suitable for relatively large and flat surfaces of die casting products.

　　The Rockwell hardness test is another popular approach. It involves using a diamond cone or a steel ball indenter. The indenter is pressed into the sample under an initial minor load followed by a major load. The depth of penetration is measured, and the Rockwell hardness value is determined. There are different Rockwell scales depending on the type of indenter and the load used, making it versatile for different die casting materials with varying hardness ranges.

　　The Vickers hardness test uses a diamond pyramid shaped indenter. A load is applied to the sample, and the diagonals of the resulting indentation are measured. The Vickers hardness number (HV) is then calculated. This method is particularly useful for small or thin die casting parts as it can provide more accurate results in such cases.

　　For micro hardness testing of die casting products, methods like the Knoop hardness test can be employed. The Knoop indenter has an elongated diamond shape, and the test is suitable for measuring the hardness of very small areas or thin layers on the die casting surface. Each of these methods has its own advantages and limitations, and the choice of the test method depends on the specific requirements of the die casting product and the available equipment.

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